/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/

#ifndef ZABBIX_AVAILABILITY_H
#define ZABBIX_AVAILABILITY_H

#include "zbxtypes.h"
#include "zbxdbhigh.h"
#include "zbxipcservice.h"
#include "zbxthreads.h"

/* agent (ZABBIX, SNMP, IPMI, JMX) availability data */
typedef struct
{
	/* flags specifying which fields are set, see ZBX_FLAGS_AGENT_STATUS_* defines */
	unsigned char	flags;

	/* agent availability fields */
	unsigned char	available;
	char		*error;
	int		errors_from;
	int		disable_until;
}
zbx_agent_availability_t;

#define ZBX_FLAGS_AGENT_STATUS_NONE		0x00000000
#define ZBX_FLAGS_AGENT_STATUS_AVAILABLE	0x00000001
#define ZBX_FLAGS_AGENT_STATUS_ERROR		0x00000002
#define ZBX_FLAGS_AGENT_STATUS_ERRORS_FROM	0x00000004
#define ZBX_FLAGS_AGENT_STATUS_DISABLE_UNTIL	0x00000008

#define ZBX_FLAGS_AGENT_STATUS		(ZBX_FLAGS_AGENT_STATUS_AVAILABLE |	\
					ZBX_FLAGS_AGENT_STATUS_ERROR |		\
					ZBX_FLAGS_AGENT_STATUS_ERRORS_FROM |	\
					ZBX_FLAGS_AGENT_STATUS_DISABLE_UNTIL)

typedef struct
{
	zbx_uint64_t			interfaceid;
	zbx_agent_availability_t	agent;
	/* ensure chronological order in case of flapping interface availability */
	int				id;
}
zbx_interface_availability_t;

ZBX_PTR_VECTOR_DECL(availability_ptr, zbx_interface_availability_t *)

int	zbx_interface_availability_compare_func(const void *d1, const void *d2);

void	zbx_availability_send(zbx_uint32_t code, unsigned char *data, zbx_uint32_t size, zbx_ipc_message_t *response);
void	zbx_availabilities_flush(const zbx_vector_availability_ptr_t *interface_availabilities);

typedef struct
{
	zbx_hashset_t	hosts;
	zbx_hashset_t	queue;
	zbx_hashset_t	proxy_avail;
	double		last_status_refresh;
	double		last_proxy_avail_refresh;
}
zbx_avail_active_hb_cache_t;

typedef struct
{
	zbx_uint64_t	hostid;
	int		lastaccess_active;
	int		heartbeat_freq;
	int		active_status;
}
zbx_host_active_avail_t;

typedef struct
{
	zbx_uint64_t	hostid;
	int		status;
}
zbx_proxy_hostdata_t;

ZBX_PTR_VECTOR_DECL(proxy_hostdata_ptr, zbx_proxy_hostdata_t *)

void	zbx_proxy_hostdata_free(zbx_proxy_hostdata_t *ph);
void	zbx_availability_serialize_json_hostdata(zbx_vector_proxy_hostdata_ptr_t *hostdata, struct zbx_json *j);
int	zbx_get_active_agent_availability(zbx_uint64_t hostid);

void	zbx_interface_availability_init(zbx_interface_availability_t *availability, zbx_uint64_t interfaceid);
void	zbx_interface_availability_clean(zbx_interface_availability_t *ia);
void	zbx_interface_availability_free(zbx_interface_availability_t *availability);
void	zbx_agent_availability_init(zbx_agent_availability_t *agent, unsigned char available, const char *error,
		int errors_from, int disable_until);

int	zbx_interface_availability_is_set(const zbx_interface_availability_t *ia);

void	zbx_db_update_interface_availabilities(const zbx_vector_availability_ptr_t *interface_availabilities);

void	zbx_availability_serialize_interface(unsigned char **data, size_t *data_alloc, size_t *data_offset,
		const zbx_interface_availability_t *interface_availability);

void	zbx_availability_deserialize(const unsigned char *data, zbx_uint32_t size,
		zbx_vector_availability_ptr_t  *interface_availabilities);

void	zbx_availability_deserialize_active_hb(const unsigned char *data, zbx_host_active_avail_t *avail);

zbx_uint32_t	zbx_availability_serialize_active_heartbeat(unsigned char **data, zbx_uint64_t hostid,
		int heartbeat_freq);

zbx_uint32_t	zbx_availability_serialize_hostdata(unsigned char **data, zbx_hashset_t *queue);
void	zbx_availability_deserialize_hostdata(const unsigned char *data, zbx_vector_proxy_hostdata_ptr_t *hostdata);

zbx_uint32_t	zbx_availability_serialize_active_status_request(unsigned char **data, zbx_uint64_t hostid);
void	zbx_availability_deserialize_active_status_request(const unsigned char *data, zbx_uint64_t *hostid);

zbx_uint32_t	zbx_availability_serialize_active_status_response(unsigned char **data, int status);
void	zbx_availability_deserialize_active_status_response(const unsigned char *data, int *status);

zbx_uint32_t	zbx_availability_serialize_proxy_hostdata(unsigned char **data, zbx_vector_proxy_hostdata_ptr_t *hosts,
		zbx_uint64_t proxyid);
void	zbx_availability_deserialize_proxy_hostdata(const unsigned char *data,
		zbx_vector_proxy_hostdata_ptr_t *hostdata, zbx_uint64_t *proxyid);

zbx_uint32_t	zbx_availability_serialize_hostids(unsigned char **data, zbx_vector_uint64_t *hostids);
void	zbx_availability_deserialize_hostids(const unsigned char *data, zbx_vector_uint64_t *hostids);

void	zbx_availability_deserialize_active_proxy_hb_update(const unsigned char *data, zbx_uint64_t *hostid);

ZBX_THREAD_ENTRY(zbx_availability_manager_thread, args);

#endif /* ZABBIX_AVAILABILITY_H */
